I'd have to mention the two following points
first off thunderware comes so close as to be near identical to what i've heard friends who work in LE refer to as "vasectomy carry", regardless of all other considerations, you're sticking a gun (known "LOADED gun" at that) in your pants in intimate proximity to an area of your body that if damage DOES occur then it will likely be irreparable, if not lethal, a wound to that reigon can bleed out FAST!
second, If it's not worth the trouble to talk this out with her (at whatever pace is necessary) to find out if she's amenable to YOU having a gun and your reasons behind them, and then deciding what to do on your end based on her reactions. then maybe you need to rethink the whole relationship, ie why are YOU in it. again if this relationship continues to remain serious and "develop" so to speak she WILL find out, and taking steps/pains to hide your choices is lying to her. i know that if i'd done so with some of the ladies i dated they would have seen the ommission in the same light as if i'd been unfaithful to them. if you choose to lie about this, what else , she will ask herself, have you or will you lie about as well??
i will not counsel you to dump her, that's not appropriate, as so far you have not stated that she is completely and totally against firearms at a core level.
asthetic objections, "that's an icky bad nasty thing! i'm not touching it" or "that LOOKS evil" (i'm working with my step-daughter on that one) can be overcome, as well as a number of what you might call moral objections, "guns are use to kill people" etc, what usually can not be overcome are objections that have become indoctrinated into the person's mindset and personal veiw of the world at a core level. or alternately, you have people like my own mother who lost her brother to a still inadequately explained AD, that have reasons to dislike guns due to personal history.
what you need to find out is where her objections to firearms really are, are they something that can be overcome or toned down, or is she so against firearms that she is unwilling to have them known ot be near her?